/*
 * random.c -- A strong random number generator
 *
 * Copyright (C) 2017 Jason A. Donenfeld <Jason@zx2c4.com>. All
 * Rights Reserved.
 *
 * Copyright Matt Mackall <mpm@selenic.com>, 2003, 2004, 2005
 *
 * Copyright Theodore Ts'o, 1994, 1995, 1996, 1997, 1998, 1999.  All
 * rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, and the entire permission notice in its entirety,
 *    including the disclaimer of warranties.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * ALTERNATIVELY, this product may be distributed under the terms of
 * the GNU General Public License, in which case the provisions of the GPL are
 * required INSTEAD OF the above restrictions.  (This clause is
 * necessary due to a potential bad interaction between the GPL and
 * the restrictions contained in a BSD-style copyright.)
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

/*
 * (now, with legal B.S. out of the way.....)
 *
 * This routine gathers environmental noise from device drivers, etc.,
 * and returns good random numbers, suitable for cryptographic use.
 * Besides the obvious cryptographic uses, these numbers are also good
 * for seeding TCP sequence numbers, and other places where it is
 * desirable to have numbers which are not only random, but hard to
 * predict by an attacker.
 *
 * Theory of operation
 * ===================
 *
 * Computers are very predictable devices.  Hence it is extremely hard
 * to produce truly random numbers on a computer --- as opposed to
 * pseudo-random numbers, which can easily generated by using a
 * algorithm.  Unfortunately, it is very easy for attackers to guess
 * the sequence of pseudo-random number generators, and for some
 * applications this is not acceptable.  So instead, we must try to
 * gather "environmental noise" from the computer's environment, which
 * must be hard for outside attackers to observe, and use that to
 * generate random numbers.  In a Unix environment, this is best done
 * from inside the kernel.
 *
 * Sources of randomness from the environment include inter-keyboard
 * timings, inter-interrupt timings from some interrupts, and other
 * events which are both (a) non-deterministic and (b) hard for an
 * outside observer to measure.  Randomness from these sources are
 * added to an "entropy pool", which is mixed using a CRC-like function.
 * This is not cryptographically strong, but it is adequate assuming
 * the randomness is not chosen maliciously, and it is fast enough that
 * the overhead of doing it on every interrupt is very reasonable.
 * As random bytes are mixed into the entropy pool, the routines keep
 * an *estimate* of how many bits of randomness have been stored into
 * the random number generator's internal state.
 *
 * When random bytes are desired, they are obtained by taking the SHA
 * hash of the contents of the "entropy pool".  The SHA hash avoids
 * exposing the internal state of the entropy pool.  It is believed to
 * be computationally infeasible to derive any useful information
 * about the input of SHA from its output.  Even if it is possible to
 * analyze SHA in some clever way, as long as the amount of data
 * returned from the generator is less than the inherent entropy in
 * the pool, the output data is totally unpredictable.  For this
 * reason, the routine decreases its internal estimate of how many
 * bits of "true randomness" are contained in the entropy pool as it
 * outputs random numbers.
 *
 * If this estimate goes to zero, the routine can still generate
 * random numbers; however, an attacker may (at least in theory) be
 * able to infer the future output of the generator from prior
 * outputs.  This requires successful cryptanalysis of SHA, which is
 * not believed to be feasible, but there is a remote possibility.
 * Nonetheless, these numbers should be useful for the vast majority
 * of purposes.
 *
 * Exported interfaces ---- output
 * ===============================
 *
 * There are four exported interfaces; two for use within the kernel,
 * and two or use from userspace.
 *
 * Exported interfaces ---- userspace output
 * -----------------------------------------
 *
 * The userspace interfaces are two character devices /dev/random and
 * /dev/urandom.  /dev/random is suitable for use when very high
 * quality randomness is desired (for example, for key generation or
 * one-time pads), as it will only return a maximum of the number of
 * bits of randomness (as estimated by the random number generator)
 * contained in the entropy pool.
 *
 * The /dev/urandom device does not have this limit, and will return
 * as many bytes as are requested.  As more and more random bytes are
 * requested without giving time for the entropy pool to recharge,
 * this will result in random numbers that are merely cryptographically
 * strong.  For many applications, however, this is acceptable.
 *
 * Exported interfaces ---- kernel output
 * --------------------------------------
 *
 * The primary kernel interface is
 *
 * 	void get_random_bytes(void *buf, int nbytes);
 *
 * This interface will return the requested number of random bytes,
 * and place it in the requested buffer.  This is equivalent to a
 * read from /dev/urandom.
 *
 * For less critical applications, there are the functions:
 *
 * 	u32 get_random_u32()
 * 	u64 get_random_u64()
 * 	unsigned int get_random_int()
 * 	unsigned long get_random_long()
 *
 * These are produced by a cryptographic RNG seeded from get_random_bytes,
 * and so do not deplete the entropy pool as much.  These are recommended
 * for most in-kernel operations *if the result is going to be stored in
 * the kernel*.
 *
 * Specifically, the get_random_int() family do not attempt to do
 * "anti-backtracking".  If you capture the state of the kernel (e.g.
 * by snapshotting the VM), you can figure out previous get_random_int()
 * return values.  But if the value is stored in the kernel anyway,
 * this is not a problem.
 *
 * It *is* safe to expose get_random_int() output to attackers (e.g. as
 * network cookies); given outputs 1..n, it's not feasible to predict
 * outputs 0 or n+1.  The only concern is an attacker who breaks into
 * the kernel later; the get_random_int() engine is not reseeded as
 * often as the get_random_bytes() one.
 *
 * get_random_bytes() is needed for keys that need to stay secret after
 * they are erased from the kernel.  For example, any key that will
 * be wrapped and stored encrypted.  And session encryption keys: we'd
 * like to know that after the session is closed and the keys erased,
 * the plaintext is unrecoverable to someone who recorded the ciphertext.
 *
 * But for network ports/cookies, stack canaries, PRNG seeds, address
 * space layout randomization, session *authentication* keys, or other
 * applications where the sensitive data is stored in the kernel in
 * plaintext for as long as it's sensitive, the get_random_int() family
 * is just fine.
 *
 * Consider ASLR.  We want to keep the address space secret from an
 * outside attacker while the process is running, but once the address
 * space is torn down, it's of no use to an attacker any more.  And it's
 * stored in kernel data structures as long as it's alive, so worrying
 * about an attacker's ability to extrapolate it from the get_random_int()
 * CRNG is silly.
 *
 * Even some cryptographic keys are safe to generate with get_random_int().
 * In particular, keys for SipHash are generally fine.  Here, knowledge
 * of the key authorizes you to do something to a kernel object (inject
 * packets to a network connection, or flood a hash table), and the
 * key is stored with the object being protected.  Once it goes away,
 * we no longer care if anyone knows the key.
 *
 * prandom_u32()
 * -------------
 *
 * For even weaker applications, see the pseudorandom generator
 * prandom_u32(), prandom_max(), and prandom_bytes().  If the random
 * numbers aren't security-critical at all, these are *far* cheaper.
 * Useful for self-tests, random error simulation, randomized backoffs,
 * and any other application where you trust that nobody is trying to
 * maliciously mess with you by guessing the "random" numbers.
 *
 * Exported interfaces ---- input
 * ==============================
 *
 * The current exported interfaces for gathering environmental noise
 * from the devices are:
 *
 *	void add_device_randomness(const void *buf, unsigned int size);
 * 	void add_input_randomness(unsigned int type, unsigned int code,
 *                                unsigned int value);
 *	void add_interrupt_randomness(int irq, int irq_flags);
 * 	void add_disk_randomness(struct gendisk *disk);
 *
 * add_device_randomness() is for adding data to the random pool that
 * is likely to differ between two devices (or possibly even per boot).
 * This would be things like MAC addresses or serial numbers, or the
 * read-out of the RTC. This does *not* add any actual entropy to the
 * pool, but it initializes the pool to different values for devices
 * that might otherwise be identical and have very little entropy
 * available to them (particularly common in the embedded world).
 *
 * add_input_randomness() uses the input layer interrupt timing, as well as
 * the event type information from the hardware.
 *
 * add_interrupt_randomness() uses the interrupt timing as random
 * inputs to the entropy pool. Using the cycle counters and the irq source
 * as inputs, it feeds the randomness roughly once a second.
 *
 * add_disk_randomness() uses what amounts to the seek time of block
 * layer request events, on a per-disk_devt basis, as input to the
 * entropy pool. Note that high-speed solid state drives with very low
 * seek times do not make for good sources of entropy, as their seek
 * times are usually fairly consistent.
 *
 * All of these routines try to estimate how many bits of randomness a
 * particular randomness source.  They do this by keeping track of the
 * first and second order deltas of the event timings.
 *
 * Ensuring unpredictability at system startup
 * ============================================
 *
 * When any operating system starts up, it will go through a sequence
 * of actions that are fairly predictable by an adversary, especially
 * if the start-up does not involve interaction with a human operator.
 * This reduces the actual number of bits of unpredictability in the
 * entropy pool below the value in entropy_count.  In order to
 * counteract this effect, it helps to carry information in the
 * entropy pool across shut-downs and start-ups.  To do this, put the
 * following lines an appropriate script which is run during the boot
 * sequence:
 *
 *	echo "Initializing random number generator..."
 *	random_seed=/var/run/random-seed
 *	# Carry a random seed from start-up to start-up
 *	# Load and then save the whole entropy pool
 *	if [ -f $random_seed ]; then
 *		cat $random_seed >/dev/urandom
 *	else
 *		touch $random_seed
 *	fi
 *	chmod 600 $random_seed
 *	dd if=/dev/urandom of=$random_seed count=1 bs=512
 *
 * and the following lines in an appropriate script which is run as
 * the system is shutdown:
 *
 *	# Carry a random seed from shut-down to start-up
 *	# Save the whole entropy pool
 *	echo "Saving random seed..."
 *	random_seed=/var/run/random-seed
 *	touch $random_seed
 *	chmod 600 $random_seed
 *	dd if=/dev/urandom of=$random_seed count=1 bs=512
 *
 * For example, on most modern systems using the System V init
 * scripts, such code fragments would be found in
 * /etc/rc.d/init.d/random.  On older Linux systems, the correct script
 * location might be in /etc/rcb.d/rc.local or /etc/rc.d/rc.0.
 *
 * Effectively, these commands cause the contents of the entropy pool
 * to be saved at shut-down time and reloaded into the entropy pool at
 * start-up.  (The 'dd' in the addition to the bootup script is to
 * make sure that /etc/random-seed is different for every start-up,
 * even if the system crashes without executing rc.0.)  Even with
 * complete knowledge of the start-up activities, predicting the state
 * of the entropy pool requires knowledge of the previous history of
 * the system.
 *
 * Configuring the /dev/random driver under Linux
 * ==============================================
 *
 * The /dev/random driver under Linux uses minor numbers 8 and 9 of
 * the /dev/mem major number (#1).  So if your system does not have
 * /dev/random and /dev/urandom created already, they can be created
 * by using the commands:
 *
 * 	mknod /dev/random c 1 8
 * 	mknod /dev/urandom c 1 9
 *
 * Acknowledgements:
 * =================
 *
 * Ideas for constructing this random number generator were derived
 * from Pretty Good Privacy's random number generator, and from private
 * discussions with Phil Karn.  Colin Plumb provided a faster random
 * number generator, which speed up the mixing function of the entropy
 * pool, taken from PGPfone.  Dale Worley has also contributed many
 * useful ideas and suggestions to improve this driver.
 *
 * Any flaws in the design are solely my responsibility, and should
 * not be attributed to the Phil, Colin, or any of authors of PGP.
 *
 * Further background information on this topic may be obtained from
 * RFC 1750, "Randomness Recommendations for Security", by Donald
 * Eastlake, Steve Crocker, and Jeff Schiller.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <generated/deconfig.h>
#include <linux/utsname.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/nodemask.h>
#include <linux/spinlock.h>
#include <linux/kthread.h>
#include <linux/percpu.h>
#include <linux/fips.h>
#include <linux/ptrace.h>
#include <linux/workqueue.h>
#include <linux/irq.h>
#include <linux/ratelimit.h>
#include <linux/syscalls.h>
#include <linux/completion.h>
#include <linux/uuid.h>
#include <crypto/chacha.h>
#include <crypto/sha.h>

#include <asm/processor.h>
#include <linux/uaccess.h>
#include <asm/irq.h>
#include <asm/irq_regs.h>
#include <asm/io.h>

#define CREATE_TRACE_POINTS
#include <trace/events/random.h>

//#include "rng.h"

/* #define ADD_INTERRUPT_BENCH */

/*
 * Configuration information
 */
#define INPUT_POOL_SHIFT	12
#define INPUT_POOL_WORDS	(1 << (INPUT_POOL_SHIFT-5))
#define OUTPUT_POOL_SHIFT	10
#define OUTPUT_POOL_WORDS	(1 << (OUTPUT_POOL_SHIFT-5))
#define EXTRACT_SIZE		10


#define LONGS(x) (((x) + sizeof(unsigned long) - 1)/sizeof(unsigned long))

/*
 * To allow fractional bits to be tracked, the entropy_count field is
 * denominated in units of 1/8th bits.
 *
 * 2*(ENTROPY_SHIFT + poolbitshift) must <= 31, or the multiply in
 * credit_entropy_bits() needs to be 64 bits wide.
 */
#define ENTROPY_SHIFT 3
#define ENTROPY_BITS(r) ((r)->entropy_count >> ENTROPY_SHIFT)

/*
 * If the entropy count falls under this number of bits, then we
 * should wake up processes which are selecting or polling on write
 * access to /dev/random.
 */
static int random_write_wakeup_bits = 28 * OUTPUT_POOL_WORDS;

/*
 * Originally, we used a primitive polynomial of degree .poolwords
 * over GF(2).  The taps for various sizes are defined below.  They
 * were chosen to be evenly spaced except for the last tap, which is 1
 * to get the twisting happening as fast as possible.
 *
 * For the purposes of better mixing, we use the CRC-32 polynomial as
 * well to make a (modified) twisted Generalized Feedback Shift
 * Register.  (See M. Matsumoto & Y. Kurita, 1992.  Twisted GFSR
 * generators.  ACM Transactions on Modeling and Computer Simulation
 * 2(3):179-194.  Also see M. Matsumoto & Y. Kurita, 1994.  Twisted
 * GFSR generators II.  ACM Transactions on Modeling and Computer
 * Simulation 4:254-266)
 *
 * Thanks to Colin Plumb for suggesting this.
 *
 * The mixing operation is much less sensitive than the output hash,
 * where we use SHA-1.  All that we want of mixing operation is that
 * it be a good non-cryptographic hash; i.e. it not produce collisions
 * when fed "random" data of the sort we expect to see.  As long as
 * the pool state differs for different inputs, we have preserved the
 * input entropy and done a good job.  The fact that an intelligent
 * attacker can construct inputs that will produce controlled
 * alterations to the pool's state is not important because we don't
 * consider such inputs to contribute any randomness.  The only
 * property we need with respect to them is that the attacker can't
 * increase his/her knowledge of the pool's state.  Since all
 * additions are reversible (knowing the final state and the input,
 * you can reconstruct the initial state), if an attacker has any
 * uncertainty about the initial state, he/she can only shuffle that
 * uncertainty about, but never cause any collisions (which would
 * decrease the uncertainty).
 *
 * Our mixing functions were analyzed by Lacharme, Roeck, Strubel, and
 * Videau in their paper, "The Linux Pseudorandom Number Generator
 * Revisited" (see: http://eprint.iacr.org/2012/251.pdf).  In their
 * paper, they point out that we are not using a true Twisted GFSR,
 * since Matsumoto & Kurita used a trinomial feedback polynomial (that
 * is, with only three taps, instead of the six that we are using).
 * As a result, the resulting polynomial is neither primitive nor
 * irreducible, and hence does not have a maximal period over
 * GF(2**32).  They suggest a slight change to the generator
 * polynomial which improves the resulting TGFSR polynomial to be
 * irreducible, which we have made here.
 */
static const struct poolinfo {
	int poolbitshift, poolwords, poolbytes, poolfracbits;
#define S(x) ilog2(x)+5, (x), (x)*4, (x) << (ENTROPY_SHIFT+5)
	int tap1, tap2, tap3, tap4, tap5;
} poolinfo_table[] = {
	/* was: x^128 + x^103 + x^76 + x^51 +x^25 + x + 1 */
	/* x^128 + x^104 + x^76 + x^51 +x^25 + x + 1 */
	{ S(128),	104,	76,	51,	25,	1 },
};

///*
// * Static global variables
// */
//static DECLARE_WAIT_QUEUE_HEAD(random_write_wait);
//static struct fasync_struct *fasync;

//static DEFINE_SPINLOCK(random_ready_list_lock);
//static LIST_HEAD(random_ready_list);

//struct crng_state {
//	__u32		state[16];
//	unsigned long	init_time;
//	spinlock_t	lock;
//};

//static struct crng_state primary_crng = {
//	.lock = __SPIN_LOCK_UNLOCKED(primary_crng.lock),
//};

///*
// * crng_init =  0 --> Uninitialized
// *		1 --> Initialized
// *		2 --> Initialized from input_pool
// *
// * crng_init is protected by primary_crng->lock, and only increases
// * its value (from 0->1->2).
// */
//static int crng_init = 0;
//#define crng_ready() (likely(crng_init > 1))
//static int crng_init_cnt = 0;
//static unsigned long crng_global_init_time = 0;
//#define CRNG_INIT_CNT_THRESH (2*CHACHA_KEY_SIZE)
//static void _extract_crng(struct crng_state *crng, __u8 out[CHACHA_BLOCK_SIZE]);
//static void _crng_backtrack_protect(struct crng_state *crng,
//				    __u8 tmp[CHACHA_BLOCK_SIZE], int used);
//static void process_random_ready_list(void);
//static void _get_random_bytes(void *buf, int nbytes);

//static struct ratelimit_state unseeded_warning =
//	RATELIMIT_STATE_INIT("warn_unseeded_randomness", HZ, 3);
//static struct ratelimit_state urandom_warning =
//	RATELIMIT_STATE_INIT("warn_urandom_randomness", HZ, 3);

//static int ratelimit_disable __read_mostly;

//module_param_named(ratelimit_disable, ratelimit_disable, int, 0644);
//MODULE_PARM_DESC(ratelimit_disable, "Disable random ratelimit suppression");

///**********************************************************************
// *
// * OS independent entropy store.   Here are the functions which handle
// * storing entropy in an entropy pool.
// *
// **********************************************************************/

//struct entropy_store;
//struct entropy_store {
//	/* read-only data: */
//	const struct poolinfo *poolinfo;
//	__u32 *pool;
//	const char *name;

//	/* read-write data: */
//	spinlock_t lock;
//	unsigned short add_ptr;
//	unsigned short input_rotate;
//	int entropy_count;
//	unsigned int initialized:1;
//	unsigned int last_data_init:1;
//	__u8 last_data[EXTRACT_SIZE];
//};

//static ssize_t extract_entropy(struct entropy_store *r, void *buf,
//			       size_t nbytes, int min, int rsvd);
//static ssize_t _extract_entropy(struct entropy_store *r, void *buf,
//				size_t nbytes, int fips);

//static void crng_reseed(struct crng_state *crng, struct entropy_store *r);
//static __u32 input_pool_data[INPUT_POOL_WORDS] __latent_entropy;

//static struct entropy_store input_pool = {
//	.poolinfo = &poolinfo_table[0],
//	.name = "input",
//	.lock = __SPIN_LOCK_UNLOCKED(input_pool.lock),
//	.pool = input_pool_data
//};

//static __u32 const twist_table[8] = {
//	0x00000000, 0x3b6e20c8, 0x76dc4190, 0x4db26158,
//	0xedb88320, 0xd6d6a3e8, 0x9b64c2b0, 0xa00ae278 };

///*
// * This function adds bytes into the entropy "pool".  It does not
// * update the entropy estimate.  The caller should call
// * credit_entropy_bits if this is appropriate.
// *
// * The pool is stirred with a primitive polynomial of the appropriate
// * degree, and then twisted.  We twist by three bits at a time because
// * it's cheap to do so and helps slightly in the expected case where
// * the entropy is concentrated in the low-order bits.
// */
//static void _mix_pool_bytes(struct entropy_store *r, const void *in,
//			    int nbytes)
//{
//	unsigned long i, tap1, tap2, tap3, tap4, tap5;
//	int input_rotate;
//	int wordmask = r->poolinfo->poolwords - 1;
//	const char *bytes = in;
//	__u32 w;

//	tap1 = r->poolinfo->tap1;
//	tap2 = r->poolinfo->tap2;
//	tap3 = r->poolinfo->tap3;
//	tap4 = r->poolinfo->tap4;
//	tap5 = r->poolinfo->tap5;

//	input_rotate = r->input_rotate;
//	i = r->add_ptr;

//	/* mix one byte at a time to simplify size handling and churn faster */
//	while (nbytes--) {
//		w = rol32(*bytes++, input_rotate);
//		i = (i - 1) & wordmask;

//		/* XOR in the various taps */
//		w ^= r->pool[i];
//		w ^= r->pool[(i + tap1) & wordmask];
//		w ^= r->pool[(i + tap2) & wordmask];
//		w ^= r->pool[(i + tap3) & wordmask];
//		w ^= r->pool[(i + tap4) & wordmask];
//		w ^= r->pool[(i + tap5) & wordmask];

//		/* Mix the result back in with a twist */
//		r->pool[i] = (w >> 3) ^ twist_table[w & 7];

//		/*
//		 * Normally, we add 7 bits of rotation to the pool.
//		 * At the beginning of the pool, add an extra 7 bits
//		 * rotation, so that successive passes spread the
//		 * input bits across the pool evenly.
//		 */
//		input_rotate = (input_rotate + (i ? 7 : 14)) & 31;
//	}

//	r->input_rotate = input_rotate;
//	r->add_ptr = i;
//}

//static void __mix_pool_bytes(struct entropy_store *r, const void *in,
//			     int nbytes)
//{
//	trace_mix_pool_bytes_nolock(r->name, nbytes, _RET_IP_);
//	_mix_pool_bytes(r, in, nbytes);
//}

//static void mix_pool_bytes(struct entropy_store *r, const void *in,
//			   int nbytes)
//{
//	unsigned long flags;

//	trace_mix_pool_bytes(r->name, nbytes, _RET_IP_);
//	spin_lock_irqsave(&r->lock, flags);
//	_mix_pool_bytes(r, in, nbytes);
//	spin_unlock_irqrestore(&r->lock, flags);
//}

//struct fast_pool {
//	__u32		pool[4];
//	unsigned long	last;
//	unsigned short	reg_idx;
//	unsigned char	count;
//};

///*
// * This is a fast mixing routine used by the interrupt randomness
// * collector.  It's hardcoded for an 128 bit pool and assumes that any
// * locks that might be needed are taken by the caller.
// */
//static void fast_mix(struct fast_pool *f)
//{
//	__u32 a = f->pool[0],	b = f->pool[1];
//	__u32 c = f->pool[2],	d = f->pool[3];

//	a += b;			c += d;
//	b = rol32(b, 6);	d = rol32(d, 27);
//	d ^= a;			b ^= c;

//	a += b;			c += d;
//	b = rol32(b, 16);	d = rol32(d, 14);
//	d ^= a;			b ^= c;

//	a += b;			c += d;
//	b = rol32(b, 6);	d = rol32(d, 27);
//	d ^= a;			b ^= c;

//	a += b;			c += d;
//	b = rol32(b, 16);	d = rol32(d, 14);
//	d ^= a;			b ^= c;

//	f->pool[0] = a;  f->pool[1] = b;
//	f->pool[2] = c;  f->pool[3] = d;
//	f->count++;
//}

//static void process_random_ready_list(void)
//{
//	unsigned long flags;
//	struct random_ready_callback *rdy, *tmp;

//	spin_lock_irqsave(&random_ready_list_lock, flags);
//	list_for_each_entry_safe(rdy, tmp, &random_ready_list, list) {
//		struct module *owner = rdy->owner;

//		list_del_init(&rdy->list);
//		rdy->func(rdy);
//		module_put(owner);
//	}
//	spin_unlock_irqrestore(&random_ready_list_lock, flags);
//}

///*
// * Credit (or debit) the entropy store with n bits of entropy.
// * Use credit_entropy_bits_safe() if the value comes from userspace
// * or otherwise should be checked for extreme values.
// */
//static void credit_entropy_bits(struct entropy_store *r, int nbits)
//{
//	int entropy_count, orig, has_initialized = 0;
//	const int pool_size = r->poolinfo->poolfracbits;
//	int nfrac = nbits << ENTROPY_SHIFT;

//	if (!nbits)
//		return;

//retry:
//	entropy_count = orig = READ_ONCE(r->entropy_count);
//	if (nfrac < 0) {
//		/* Debit */
//		entropy_count += nfrac;
//	} else {
//		/*
//		 * Credit: we have to account for the possibility of
//		 * overwriting already present entropy.	 Even in the
//		 * ideal case of pure Shannon entropy, new contributions
//		 * approach the full value asymptotically:
//		 *
//		 * entropy <- entropy + (pool_size - entropy) *
//		 *	(1 - exp(-add_entropy/pool_size))
//		 *
//		 * For add_entropy <= pool_size/2 then
//		 * (1 - exp(-add_entropy/pool_size)) >=
//		 *    (add_entropy/pool_size)*0.7869...
//		 * so we can approximate the exponential with
//		 * 3/4*add_entropy/pool_size and still be on the
//		 * safe side by adding at most pool_size/2 at a time.
//		 *
//		 * The use of pool_size-2 in the while statement is to
//		 * prevent rounding artifacts from making the loop
//		 * arbitrarily long; this limits the loop to log2(pool_size)*2
//		 * turns no matter how large nbits is.
//		 */
//		int pnfrac = nfrac;
//		const int s = r->poolinfo->poolbitshift + ENTROPY_SHIFT + 2;
//		/* The +2 corresponds to the /4 in the denominator */

//		do {
//			unsigned int anfrac = min(pnfrac, pool_size/2);
//			unsigned int add =
//				((pool_size - entropy_count)*anfrac*3) >> s;

//			entropy_count += add;
//			pnfrac -= anfrac;
//		} while (unlikely(entropy_count < pool_size-2 && pnfrac));
//	}

//	if (WARN_ON(entropy_count < 0)) {
//		pr_warn("negative entropy/overflow: pool %s count %d\n",
//			r->name, entropy_count);
//		entropy_count = 0;
//	} else if (entropy_count > pool_size)
//		entropy_count = pool_size;
//	if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig)
//		goto retry;

//	if (has_initialized) {
//		r->initialized = 1;
//		kill_fasync(&fasync, SIGIO, POLL_IN);
//	}

//	trace_credit_entropy_bits(r->name, nbits,
//				  entropy_count >> ENTROPY_SHIFT, _RET_IP_);

//	if (r == &input_pool) {
//		int entropy_bits = entropy_count >> ENTROPY_SHIFT;

//		if (crng_init < 2) {
//			if (entropy_bits < 128)
//				return;
//			crng_reseed(&primary_crng, r);
//			entropy_bits = ENTROPY_BITS(r);
//		}
//	}
//}

//static int credit_entropy_bits_safe(struct entropy_store *r, int nbits)
//{
//	const int nbits_max = r->poolinfo->poolwords * 32;

//	if (nbits < 0)
//		return -EINVAL;

//	/* Cap the value to avoid overflows */
//	nbits = min(nbits,  nbits_max);

//	credit_entropy_bits(r, nbits);
//	return 0;
//}

///*********************************************************************
// *
// * CRNG using CHACHA20
// *
// *********************************************************************/

//#define CRNG_RESEED_INTERVAL (300*HZ)

//static DECLARE_WAIT_QUEUE_HEAD(crng_init_wait);

//#ifdef CONFIG_NUMA
///*
// * Hack to deal with crazy userspace progams when they are all trying
// * to access /dev/urandom in parallel.  The programs are almost
// * certainly doing something terribly wrong, but we'll work around
// * their brain damage.
// */
//static struct crng_state **crng_node_pool __read_mostly;
//#endif

//static void invalidate_batched_entropy(void);
//static void numa_crng_init(void);

//static bool trust_cpu __ro_after_init = IS_ENABLED(CONFIG_RANDOM_TRUST_CPU);
//static int __init parse_trust_cpu(char *arg)
//{
//	return kstrtobool(arg, &trust_cpu);
//}
//early_param("random.trust_cpu", parse_trust_cpu);

//static bool crng_init_try_arch(struct crng_state *crng)
//{
//	int		i;
//	bool		arch_init = true;
//	unsigned long	rv;

//	for (i = 4; i < 16; i++) {
//		if (!arch_get_random_seed_long(&rv) &&
//		    !arch_get_random_long(&rv)) {
//			rv = random_get_entropy();
//			arch_init = false;
//		}
//		crng->state[i] ^= rv;
//	}

//	return arch_init;
//}

//static bool __init crng_init_try_arch_early(struct crng_state *crng)
//{
//	int		i;
//	bool		arch_init = true;
//	unsigned long	rv;

//	for (i = 4; i < 16; i++) {
//		if (!arch_get_random_seed_long_early(&rv) &&
//		    !arch_get_random_long_early(&rv)) {
//			rv = random_get_entropy();
//			arch_init = false;
//		}
//		crng->state[i] ^= rv;
//	}

//	return arch_init;
//}

//static void __maybe_unused crng_initialize_secondary(struct crng_state *crng)
//{
//	chacha_init_consts(crng->state);
//	_get_random_bytes(&crng->state[4], sizeof(__u32) * 12);
//	crng_init_try_arch(crng);
//	crng->init_time = jiffies - CRNG_RESEED_INTERVAL - 1;
//}

//static void __init crng_initialize_primary(struct crng_state *crng)
//{
//	chacha_init_consts(crng->state);
//	_extract_entropy(&input_pool, &crng->state[4], sizeof(__u32) * 12, 0);
//	if (crng_init_try_arch_early(crng) && trust_cpu) {
//		invalidate_batched_entropy();
//		numa_crng_init();
//		crng_init = 2;
//		pr_notice("crng done (trusting CPU's manufacturer)\n");
//	}
//	crng->init_time = jiffies - CRNG_RESEED_INTERVAL - 1;
//}

//#ifdef CONFIG_NUMA
//static void do_numa_crng_init(struct work_struct *work)
//{
//	int i;
//	struct crng_state *crng;
//	struct crng_state **pool;

//	pool = kcalloc(nr_node_ids, sizeof(*pool), GFP_KERNEL|__GFP_NOFAIL);
//	for_each_online_node(i) {
//		crng = kmalloc_node(sizeof(struct crng_state),
//				    GFP_KERNEL | __GFP_NOFAIL, i);
//		spin_lock_init(&crng->lock);
//		crng_initialize_secondary(crng);
//		pool[i] = crng;
//	}
//	mb();
//	if (cmpxchg(&crng_node_pool, NULL, pool)) {
//		for_each_node(i)
//			kfree(pool[i]);
//		kfree(pool);
//	}
//}

//static DECLARE_WORK(numa_crng_init_work, do_numa_crng_init);

//static void numa_crng_init(void)
//{
//	schedule_work(&numa_crng_init_work);
//}
//#else
//static void numa_crng_init(void) {}
//#endif

///*
// * crng_fast_load() can be called by code in the interrupt service
// * path.  So we can't afford to dilly-dally.
// */
//static int crng_fast_load(const char *cp, size_t len)
//{
//	unsigned long flags;
//	char *p;

//	if (!spin_trylock_irqsave(&primary_crng.lock, flags))
//		return 0;
//	if (crng_init != 0) {
//		spin_unlock_irqrestore(&primary_crng.lock, flags);
//		return 0;
//	}
//	p = (unsigned char *) &primary_crng.state[4];
//	while (len > 0 && crng_init_cnt < CRNG_INIT_CNT_THRESH) {
//		p[crng_init_cnt % CHACHA_KEY_SIZE] ^= *cp;
//		cp++; crng_init_cnt++; len--;
//	}
//	spin_unlock_irqrestore(&primary_crng.lock, flags);
//	if (crng_init_cnt >= CRNG_INIT_CNT_THRESH) {
//		invalidate_batched_entropy();
//		crng_init = 1;
//		pr_notice("fast init done\n");
//	}
//	return 1;
//}

///*
// * crng_slow_load() is called by add_device_randomness, which has two
// * attributes.  (1) We can't trust the buffer passed to it is
// * guaranteed to be unpredictable (so it might not have any entropy at
// * all), and (2) it doesn't have the performance constraints of
// * crng_fast_load().
// *
// * So we do something more comprehensive which is guaranteed to touch
// * all of the primary_crng's state, and which uses a LFSR with a
// * period of 255 as part of the mixing algorithm.  Finally, we do
// * *not* advance crng_init_cnt since buffer we may get may be something
// * like a fixed DMI table (for example), which might very well be
// * unique to the machine, but is otherwise unvarying.
// */
//static int crng_slow_load(const char *cp, size_t len)
//{
//	unsigned long		flags;
//	static unsigned char	lfsr = 1;
//	unsigned char		tmp;
//	unsigned		i, max = CHACHA_KEY_SIZE;
//	const char *		src_buf = cp;
//	char *			dest_buf = (char *) &primary_crng.state[4];

//	if (!spin_trylock_irqsave(&primary_crng.lock, flags))
//		return 0;
//	if (crng_init != 0) {
//		spin_unlock_irqrestore(&primary_crng.lock, flags);
//		return 0;
//	}
//	if (len > max)
//		max = len;

//	for (i = 0; i < max ; i++) {
//		tmp = lfsr;
//		lfsr >>= 1;
//		if (tmp & 1)
//			lfsr ^= 0xE1;
//		tmp = dest_buf[i % CHACHA_KEY_SIZE];
//		dest_buf[i % CHACHA_KEY_SIZE] ^= src_buf[i % len] ^ lfsr;
//		lfsr += (tmp << 3) | (tmp >> 5);
//	}
//	spin_unlock_irqrestore(&primary_crng.lock, flags);
//	return 1;
//}

//static void crng_reseed(struct crng_state *crng, struct entropy_store *r)
//{
//	unsigned long	flags;
//	int		i, num;
//	union {
//		__u8	block[CHACHA_BLOCK_SIZE];
//		__u32	key[8];
//	} buf;

//	if (r) {
//		num = extract_entropy(r, &buf, 32, 16, 0);
//		if (num == 0)
//			return;
//	} else {
//		_extract_crng(&primary_crng, buf.block);
//		_crng_backtrack_protect(&primary_crng, buf.block,
//					CHACHA_KEY_SIZE);
//	}
//	spin_lock_irqsave(&crng->lock, flags);
//	for (i = 0; i < 8; i++) {
//		unsigned long	rv;
//		if (!arch_get_random_seed_long(&rv) &&
//		    !arch_get_random_long(&rv))
//			rv = random_get_entropy();
//		crng->state[i+4] ^= buf.key[i] ^ rv;
//	}
//	memzero_explicit(&buf, sizeof(buf));
//	crng->init_time = jiffies;
//	spin_unlock_irqrestore(&crng->lock, flags);
//	if (crng == &primary_crng && crng_init < 2) {
//		invalidate_batched_entropy();
//		numa_crng_init();
//		crng_init = 2;
//		process_random_ready_list();
//		wake_up_interruptible(&crng_init_wait);
//		kill_fasync(&fasync, SIGIO, POLL_IN);
//		pr_notice("crng init done\n");
//		if (unseeded_warning.missed) {
//			pr_notice("%d get_random_xx warning(s) missed due to ratelimiting\n",
//				  unseeded_warning.missed);
//			unseeded_warning.missed = 0;
//		}
//		if (urandom_warning.missed) {
//			pr_notice("%d urandom warning(s) missed due to ratelimiting\n",
//				  urandom_warning.missed);
//			urandom_warning.missed = 0;
//		}
//	}
//}

//static void _extract_crng(struct crng_state *crng,
//			  __u8 out[CHACHA_BLOCK_SIZE])
//{
//	unsigned long v, flags;

//	if (crng_ready() &&
//	    (time_after(crng_global_init_time, crng->init_time) ||
//	     time_after(jiffies, crng->init_time + CRNG_RESEED_INTERVAL)))
//		crng_reseed(crng, crng == &primary_crng ? &input_pool : NULL);
//	spin_lock_irqsave(&crng->lock, flags);
//	if (arch_get_random_long(&v))
//		crng->state[14] ^= v;
//	chacha20_block(&crng->state[0], out);
//	if (crng->state[12] == 0)
//		crng->state[13]++;
//	spin_unlock_irqrestore(&crng->lock, flags);
//}

//static void extract_crng(__u8 out[CHACHA_BLOCK_SIZE])
//{
//	struct crng_state *crng = NULL;

//#ifdef CONFIG_NUMA
//	if (crng_node_pool)
//		crng = crng_node_pool[numa_node_id()];
//	if (crng == NULL)
//#endif
//		crng = &primary_crng;
//	_extract_crng(crng, out);
//}

///*
// * Use the leftover bytes from the CRNG block output (if there is
// * enough) to mutate the CRNG key to provide backtracking protection.
// */
//static void _crng_backtrack_protect(struct crng_state *crng,
//				    __u8 tmp[CHACHA_BLOCK_SIZE], int used)
//{
//	unsigned long	flags;
//	__u32		*s, *d;
//	int		i;

//	used = round_up(used, sizeof(__u32));
//	if (used + CHACHA_KEY_SIZE > CHACHA_BLOCK_SIZE) {
//		extract_crng(tmp);
//		used = 0;
//	}
//	spin_lock_irqsave(&crng->lock, flags);
//	s = (__u32 *) &tmp[used];
//	d = &crng->state[4];
//	for (i=0; i < 8; i++)
//		*d++ ^= *s++;
//	spin_unlock_irqrestore(&crng->lock, flags);
//}

//static void crng_backtrack_protect(__u8 tmp[CHACHA_BLOCK_SIZE], int used)
//{
//	struct crng_state *crng = NULL;

//#ifdef CONFIG_NUMA
//	if (crng_node_pool)
//		crng = crng_node_pool[numa_node_id()];
//	if (crng == NULL)
//#endif
//		crng = &primary_crng;
//	_crng_backtrack_protect(crng, tmp, used);
//}

//static ssize_t extract_crng_user(void __user *buf, size_t nbytes)
//{
//	ssize_t ret = 0, i = CHACHA_BLOCK_SIZE;
//	__u8 tmp[CHACHA_BLOCK_SIZE] __aligned(4);
//	int large_request = (nbytes > 256);

//	while (nbytes) {
//		if (large_request && need_resched()) {
//			if (signal_pending(current)) {
//				if (ret == 0)
//					ret = -ERESTARTSYS;
//				break;
//			}
//			schedule();
//		}

//		extract_crng(tmp);
//		i = min_t(int, nbytes, CHACHA_BLOCK_SIZE);
//		if (copy_to_user(buf, tmp, i)) {
//			ret = -EFAULT;
//			break;
//		}

//		nbytes -= i;
//		buf += i;
//		ret += i;
//	}
//	crng_backtrack_protect(tmp, i);

//	/* Wipe data just written to memory */
//	memzero_explicit(tmp, sizeof(tmp));

//	return ret;
//}


///*********************************************************************
// *
// * Entropy input management
// *
// *********************************************************************/

///* There is one of these per entropy source */
//struct timer_rand_state {
//	cycles_t last_time;
//	long last_delta, last_delta2;
//};

//#define INIT_TIMER_RAND_STATE { INITIAL_JIFFIES, };

/*
 * Add device- or boot-specific data to the input pool to help
 * initialize it.
 *
 * None of this adds any entropy; it is meant to avoid the problem of
 * the entropy pool having similar initial state across largely
 * identical devices.
 */
void add_device_randomness(const void *buf, unsigned int size)
{
//	unsigned long time = random_get_entropy() ^ jiffies;
//	unsigned long flags;

//	if (!crng_ready() && size)
//		crng_slow_load(buf, size);

//	trace_add_device_randomness(size, _RET_IP_);
//	spin_lock_irqsave(&input_pool.lock, flags);
//	_mix_pool_bytes(&input_pool, buf, size);
//	_mix_pool_bytes(&input_pool, &time, sizeof(time));
//	spin_unlock_irqrestore(&input_pool.lock, flags);
}
EXPORT_SYMBOL(add_device_randomness);

//static struct timer_rand_state input_timer_state = INIT_TIMER_RAND_STATE;

///*
// * This function adds entropy to the entropy "pool" by using timing
// * delays.  It uses the timer_rand_state structure to make an estimate
// * of how many bits of entropy this call has added to the pool.
// *
// * The number "num" is also added to the pool - it should somehow describe
// * the type of event which just happened.  This is currently 0-255 for
// * keyboard scan codes, and 256 upwards for interrupts.
// *
// */
//static void add_timer_randomness(struct timer_rand_state *state, unsigned num)
//{
//	struct entropy_store	*r;
//	struct {
//		long jiffies;
//		unsigned cycles;
//		unsigned num;
//	} sample;
//	long delta, delta2, delta3;

//	sample.jiffies = jiffies;
//	sample.cycles = random_get_entropy();
//	sample.num = num;
//	r = &input_pool;
//	mix_pool_bytes(r, &sample, sizeof(sample));

//	/*
//	 * Calculate number of bits of randomness we probably added.
//	 * We take into account the first, second and third-order deltas
//	 * in order to make our estimate.
//	 */
//	delta = sample.jiffies - READ_ONCE(state->last_time);
//	WRITE_ONCE(state->last_time, sample.jiffies);

//	delta2 = delta - READ_ONCE(state->last_delta);
//	WRITE_ONCE(state->last_delta, delta);

//	delta3 = delta2 - READ_ONCE(state->last_delta2);
//	WRITE_ONCE(state->last_delta2, delta2);

//	if (delta < 0)
//		delta = -delta;
//	if (delta2 < 0)
//		delta2 = -delta2;
//	if (delta3 < 0)
//		delta3 = -delta3;
//	if (delta > delta2)
//		delta = delta2;
//	if (delta > delta3)
//		delta = delta3;

//	/*
//	 * delta is now minimum absolute delta.
//	 * Round down by 1 bit on general principles,
//	 * and limit entropy estimate to 12 bits.
//	 */
//	credit_entropy_bits(r, min_t(int, fls(delta>>1), 11));
//}

//void add_input_randomness(unsigned int type, unsigned int code,
//				 unsigned int value)
//{
//	static unsigned char last_value;

//	/* ignore autorepeat and the like */
//	if (value == last_value)
//		return;

//	last_value = value;
//	add_timer_randomness(&input_timer_state,
//			     (type << 4) ^ code ^ (code >> 4) ^ value);
//	trace_add_input_randomness(ENTROPY_BITS(&input_pool));
//}
//EXPORT_SYMBOL_GPL(add_input_randomness);

//static DEFINE_PER_CPU(struct fast_pool, irq_randomness);

//#ifdef ADD_INTERRUPT_BENCH
//static unsigned long avg_cycles, avg_deviation;

//#define AVG_SHIFT 8     /* Exponential average factor k=1/256 */
//#define FIXED_1_2 (1 << (AVG_SHIFT-1))

//static void add_interrupt_bench(cycles_t start)
//{
//        long delta = random_get_entropy() - start;

//        /* Use a weighted moving average */
//        delta = delta - ((avg_cycles + FIXED_1_2) >> AVG_SHIFT);
//        avg_cycles += delta;
//        /* And average deviation */
//        delta = abs(delta) - ((avg_deviation + FIXED_1_2) >> AVG_SHIFT);
//        avg_deviation += delta;
//}
//#else
//#define add_interrupt_bench(x)
//#endif

//static __u32 get_reg(struct fast_pool *f, struct pt_regs *regs)
//{
//	__u32 *ptr = (__u32 *) regs;
//	unsigned int idx;

//	if (regs == NULL)
//		return 0;
//	idx = READ_ONCE(f->reg_idx);
//	if (idx >= sizeof(struct pt_regs) / sizeof(__u32))
//		idx = 0;
//	ptr += idx++;
//	WRITE_ONCE(f->reg_idx, idx);
//	return *ptr;
//}

//void add_interrupt_randomness(int irq, int irq_flags)
//{
//	struct entropy_store	*r;
//	struct fast_pool	*fast_pool = this_cpu_ptr(&irq_randomness);
//	struct pt_regs		*regs = get_irq_regs();
//	unsigned long		now = jiffies;
//	cycles_t		cycles = random_get_entropy();
//	__u32			c_high, j_high;
//	__u64			ip;
//	unsigned long		seed;
//	int			credit = 0;

//	if (cycles == 0)
//		cycles = get_reg(fast_pool, regs);
//	c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0;
//	j_high = (sizeof(now) > 4) ? now >> 32 : 0;
//	fast_pool->pool[0] ^= cycles ^ j_high ^ irq;
//	fast_pool->pool[1] ^= now ^ c_high;
//	ip = regs ? instruction_pointer(regs) : _RET_IP_;
//	fast_pool->pool[2] ^= ip;
//	fast_pool->pool[3] ^= (sizeof(ip) > 4) ? ip >> 32 :
//		get_reg(fast_pool, regs);

//	fast_mix(fast_pool);
//	add_interrupt_bench(cycles);

//	if (unlikely(crng_init == 0)) {
//		if ((fast_pool->count >= 64) &&
//		    crng_fast_load((char *) fast_pool->pool,
//				   sizeof(fast_pool->pool))) {
//			fast_pool->count = 0;
//			fast_pool->last = now;
//		}
//		return;
//	}

//	if ((fast_pool->count < 64) &&
//	    !time_after(now, fast_pool->last + HZ))
//		return;

//	r = &input_pool;
//	if (!spin_trylock(&r->lock))
//		return;

//	fast_pool->last = now;
//	__mix_pool_bytes(r, &fast_pool->pool, sizeof(fast_pool->pool));

//	/*
//	 * If we have architectural seed generator, produce a seed and
//	 * add it to the pool.  For the sake of paranoia don't let the
//	 * architectural seed generator dominate the input from the
//	 * interrupt noise.
//	 */
//	if (arch_get_random_seed_long(&seed)) {
//		__mix_pool_bytes(r, &seed, sizeof(seed));
//		credit = 1;
//	}
//	spin_unlock(&r->lock);

//	fast_pool->count = 0;

//	/* award one bit for the contents of the fast pool */
//	credit_entropy_bits(r, credit + 1);
//}
//EXPORT_SYMBOL_GPL(add_interrupt_randomness);

//#ifdef CONFIG_BLOCK
//void add_disk_randomness(struct gendisk *disk)
//{
//	if (!disk || !disk->random)
//		return;
//	/* first major is 1, so we get >= 0x200 here */
//	add_timer_randomness(disk->random, 0x100 + disk_devt(disk));
//	trace_add_disk_randomness(disk_devt(disk), ENTROPY_BITS(&input_pool));
//}
//EXPORT_SYMBOL_GPL(add_disk_randomness);
//#endif

///*********************************************************************
// *
// * Entropy extraction routines
// *
// *********************************************************************/

///*
// * This function decides how many bytes to actually take from the
// * given pool, and also debits the entropy count accordingly.
// */
//static size_t account(struct entropy_store *r, size_t nbytes, int min,
//		      int reserved)
//{
//	int entropy_count, orig, have_bytes;
//	size_t ibytes, nfrac;

//	BUG_ON(r->entropy_count > r->poolinfo->poolfracbits);

//	/* Can we pull enough? */
//retry:
//	entropy_count = orig = READ_ONCE(r->entropy_count);
//	ibytes = nbytes;
//	/* never pull more than available */
//	have_bytes = entropy_count >> (ENTROPY_SHIFT + 3);

//	if ((have_bytes -= reserved) < 0)
//		have_bytes = 0;
//	ibytes = min_t(size_t, ibytes, have_bytes);
//	if (ibytes < min)
//		ibytes = 0;

//	if (WARN_ON(entropy_count < 0)) {
//		pr_warn("negative entropy count: pool %s count %d\n",
//			r->name, entropy_count);
//		entropy_count = 0;
//	}
//	nfrac = ibytes << (ENTROPY_SHIFT + 3);
//	if ((size_t) entropy_count > nfrac)
//		entropy_count -= nfrac;
//	else
//		entropy_count = 0;

//	if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig)
//		goto retry;

//	trace_debit_entropy(r->name, 8 * ibytes);
//	if (ibytes && ENTROPY_BITS(r) < random_write_wakeup_bits) {
//		wake_up_interruptible(&random_write_wait);
//		kill_fasync(&fasync, SIGIO, POLL_OUT);
//	}

//	return ibytes;
//}

///*
// * This function does the actual extraction for extract_entropy and
// * extract_entropy_user.
// *
// * Note: we assume that .poolwords is a multiple of 16 words.
// */
//static void extract_buf(struct entropy_store *r, __u8 *out)
//{
//	int i;
//	union {
//		__u32 w[5];
//		unsigned long l[LONGS(20)];
//	} hash;
//	__u32 workspace[SHA1_WORKSPACE_WORDS];
//	unsigned long flags;

//	/*
//	 * If we have an architectural hardware random number
//	 * generator, use it for SHA's initial vector
//	 */
//	sha1_init(hash.w);
//	for (i = 0; i < LONGS(20); i++) {
//		unsigned long v;
//		if (!arch_get_random_long(&v))
//			break;
//		hash.l[i] = v;
//	}

//	/* Generate a hash across the pool, 16 words (512 bits) at a time */
//	spin_lock_irqsave(&r->lock, flags);
//	for (i = 0; i < r->poolinfo->poolwords; i += 16)
//		sha1_transform(hash.w, (__u8 *)(r->pool + i), workspace);

//	/*
//	 * We mix the hash back into the pool to prevent backtracking
//	 * attacks (where the attacker knows the state of the pool
//	 * plus the current outputs, and attempts to find previous
//	 * ouputs), unless the hash function can be inverted. By
//	 * mixing at least a SHA1 worth of hash data back, we make
//	 * brute-forcing the feedback as hard as brute-forcing the
//	 * hash.
//	 */
//	__mix_pool_bytes(r, hash.w, sizeof(hash.w));
//	spin_unlock_irqrestore(&r->lock, flags);

//	memzero_explicit(workspace, sizeof(workspace));

//	/*
//	 * In case the hash function has some recognizable output
//	 * pattern, we fold it in half. Thus, we always feed back
//	 * twice as much data as we output.
//	 */
//	hash.w[0] ^= hash.w[3];
//	hash.w[1] ^= hash.w[4];
//	hash.w[2] ^= rol32(hash.w[2], 16);

//	memcpy(out, &hash, EXTRACT_SIZE);
//	memzero_explicit(&hash, sizeof(hash));
//}

//static ssize_t _extract_entropy(struct entropy_store *r, void *buf,
//				size_t nbytes, int fips)
//{
//	ssize_t ret = 0, i;
//	__u8 tmp[EXTRACT_SIZE];
//	unsigned long flags;

//	while (nbytes) {
//		extract_buf(r, tmp);

//		if (fips) {
//			spin_lock_irqsave(&r->lock, flags);
//			if (!memcmp(tmp, r->last_data, EXTRACT_SIZE))
//				panic("Hardware RNG duplicated output!\n");
//			memcpy(r->last_data, tmp, EXTRACT_SIZE);
//			spin_unlock_irqrestore(&r->lock, flags);
//		}
//		i = min_t(int, nbytes, EXTRACT_SIZE);
//		memcpy(buf, tmp, i);
//		nbytes -= i;
//		buf += i;
//		ret += i;
//	}

//	/* Wipe data just returned from memory */
//	memzero_explicit(tmp, sizeof(tmp));

//	return ret;
//}

///*
// * This function extracts randomness from the "entropy pool", and
// * returns it in a buffer.
// *
// * The min parameter specifies the minimum amount we can pull before
// * failing to avoid races that defeat catastrophic reseeding while the
// * reserved parameter indicates how much entropy we must leave in the
// * pool after each pull to avoid starving other readers.
// */
//static ssize_t extract_entropy(struct entropy_store *r, void *buf,
//				 size_t nbytes, int min, int reserved)
//{
//	__u8 tmp[EXTRACT_SIZE];
//	unsigned long flags;

//	/* if last_data isn't primed, we need EXTRACT_SIZE extra bytes */
//	if (fips_enabled) {
//		spin_lock_irqsave(&r->lock, flags);
//		if (!r->last_data_init) {
//			r->last_data_init = 1;
//			spin_unlock_irqrestore(&r->lock, flags);
//			trace_extract_entropy(r->name, EXTRACT_SIZE,
//					      ENTROPY_BITS(r), _RET_IP_);
//			extract_buf(r, tmp);
//			spin_lock_irqsave(&r->lock, flags);
//			memcpy(r->last_data, tmp, EXTRACT_SIZE);
//		}
//		spin_unlock_irqrestore(&r->lock, flags);
//	}

//	trace_extract_entropy(r->name, nbytes, ENTROPY_BITS(r), _RET_IP_);
//	nbytes = account(r, nbytes, min, reserved);

//	return _extract_entropy(r, buf, nbytes, fips_enabled);
//}

//#define warn_unseeded_randomness(previous) \
//	_warn_unseeded_randomness(__func__, (void *) _RET_IP_, (previous))

//static void _warn_unseeded_randomness(const char *func_name, void *caller,
//				      void **previous)
//{
//#ifdef CONFIG_WARN_ALL_UNSEEDED_RANDOM
//	const bool print_once = false;
//#else
//	static bool print_once __read_mostly;
//#endif

//	if (print_once ||
//	    crng_ready() ||
//	    (previous && (caller == READ_ONCE(*previous))))
//		return;
//	WRITE_ONCE(*previous, caller);
//#ifndef CONFIG_WARN_ALL_UNSEEDED_RANDOM
//	print_once = true;
//#endif
//	if (__ratelimit(&unseeded_warning))
//		printk_deferred(KERN_NOTICE "random: %s called from %pS "
//				"with crng_init=%d\n", func_name, caller,
//				crng_init);
//}

#undef CHACHA_BLOCK_SIZE
#define CHACHA_BLOCK_SIZE   4
/*
 * This function is the exported kernel interface.  It returns some
 * number of good random numbers, suitable for key generation, seeding
 * TCP sequence numbers, etc.  It does not rely on the hardware random
 * number generator.  For random bytes direct from the hardware RNG
 * (when available), use get_random_bytes_arch(). In order to ensure
 * that the randomness provided by this function is okay, the function
 * wait_for_random_bytes() should be called and return 0 at least once
 * at any point prior.
 */
static void _get_random_bytes(void *buf, int nbytes)
{
	__u8 tmp[CHACHA_BLOCK_SIZE] __aligned(4);

	trace_get_random_bytes(nbytes, _RET_IP_);

	while (nbytes >= CHACHA_BLOCK_SIZE) {
//		extract_crng(buf);
//        HAL_RNG_GenerateRandomNumber(&hrng, buf);
		buf += CHACHA_BLOCK_SIZE;
		nbytes -= CHACHA_BLOCK_SIZE;
	}

	if (nbytes > 0) {
//		extract_crng(tmp);
//        HAL_RNG_GenerateRandomNumber(&hrng, (uint32_t *)tmp);
		memcpy(buf, tmp, nbytes);
    }
//		crng_backtrack_protect(tmp, nbytes);
//	} else
//		crng_backtrack_protect(tmp, CHACHA_BLOCK_SIZE);
	memzero_explicit(tmp, sizeof(tmp));
}

void get_random_bytes(void *buf, int nbytes)
{
//	static void *previous;

//	warn_unseeded_randomness(&previous);
	_get_random_bytes(buf, nbytes);
}
EXPORT_SYMBOL(get_random_bytes);


///*
// * Each time the timer fires, we expect that we got an unpredictable
// * jump in the cycle counter. Even if the timer is running on another
// * CPU, the timer activity will be touching the stack of the CPU that is
// * generating entropy..
// *
// * Note that we don't re-arm the timer in the timer itself - we are
// * happy to be scheduled away, since that just makes the load more
// * complex, but we do not want the timer to keep ticking unless the
// * entropy loop is running.
// *
// * So the re-arming always happens in the entropy loop itself.
// */
//static void entropy_timer(struct timer_list *t)
//{
//	credit_entropy_bits(&input_pool, 1);
//}

///*
// * If we have an actual cycle counter, see if we can
// * generate enough entropy with timing noise
// */
//static void try_to_generate_entropy(void)
//{
//	struct {
//		unsigned long now;
//		struct timer_list timer;
//	} stack;

//	stack.now = random_get_entropy();

//	/* Slow counter - or none. Don't even bother */
//	if (stack.now == random_get_entropy())
//		return;

//	timer_setup_on_stack(&stack.timer, entropy_timer, 0);
//	while (!crng_ready()) {
//		if (!timer_pending(&stack.timer))
//			mod_timer(&stack.timer, jiffies+1);
//		mix_pool_bytes(&input_pool, &stack.now, sizeof(stack.now));
//		schedule();
//		stack.now = random_get_entropy();
//	}

//	del_timer_sync(&stack.timer);
//	destroy_timer_on_stack(&stack.timer);
//	mix_pool_bytes(&input_pool, &stack.now, sizeof(stack.now));
//}

///*
// * Wait for the urandom pool to be seeded and thus guaranteed to supply
// * cryptographically secure random numbers. This applies to: the /dev/urandom
// * device, the get_random_bytes function, and the get_random_{u32,u64,int,long}
// * family of functions. Using any of these functions without first calling
// * this function forfeits the guarantee of security.
// *
// * Returns: 0 if the urandom pool has been seeded.
// *          -ERESTARTSYS if the function was interrupted by a signal.
// */
//int wait_for_random_bytes(void)
//{
//	if (likely(crng_ready()))
//		return 0;

//	do {
//		int ret;
//		ret = wait_event_interruptible_timeout(crng_init_wait, crng_ready(), HZ);
//		if (ret)
//			return ret > 0 ? 0 : ret;

//		try_to_generate_entropy();
//	} while (!crng_ready());

//	return 0;
//}
//EXPORT_SYMBOL(wait_for_random_bytes);

///*
// * Returns whether or not the urandom pool has been seeded and thus guaranteed
// * to supply cryptographically secure random numbers. This applies to: the
// * /dev/urandom device, the get_random_bytes function, and the get_random_{u32,
// * ,u64,int,long} family of functions.
// *
// * Returns: true if the urandom pool has been seeded.
// *          false if the urandom pool has not been seeded.
// */
//bool rng_is_initialized(void)
//{
//	return crng_ready();
//}
//EXPORT_SYMBOL(rng_is_initialized);

/*
 * Add a callback function that will be invoked when the nonblocking
 * pool is initialised.
 *
 * returns: 0 if callback is successfully added
 *	    -EALREADY if pool is already initialised (callback not called)
 *	    -ENOENT if module for callback is not alive
 */
int add_random_ready_callback(struct random_ready_callback *rdy)
{
	struct module *owner;
	unsigned long flags;
	int err = -EALREADY;

//	if (crng_ready())
//		return err;

//	owner = rdy->owner;
//	if (!try_module_get(owner))
//		return -ENOENT;

//	spin_lock_irqsave(&random_ready_list_lock, flags);
//	if (crng_ready())
//		goto out;

//	owner = NULL;

//	list_add(&rdy->list, &random_ready_list);
	err = 0;

//out:
//	spin_unlock_irqrestore(&random_ready_list_lock, flags);

//	module_put(owner);

	return err;
}
EXPORT_SYMBOL(add_random_ready_callback);

///*
// * Delete a previously registered readiness callback function.
// */
//void del_random_ready_callback(struct random_ready_callback *rdy)
//{
//	unsigned long flags;
//	struct module *owner = NULL;

//	spin_lock_irqsave(&random_ready_list_lock, flags);
//	if (!list_empty(&rdy->list)) {
//		list_del_init(&rdy->list);
//		owner = rdy->owner;
//	}
//	spin_unlock_irqrestore(&random_ready_list_lock, flags);

//	module_put(owner);
//}
//EXPORT_SYMBOL(del_random_ready_callback);

/*
 * This function will use the architecture-specific hardware random
 * number generator if it is available.  The arch-specific hw RNG will
 * almost certainly be faster than what we can do in software, but it
 * is impossible to verify that it is implemented securely (as
 * opposed, to, say, the AES encryption of a sequence number using a
 * key known by the NSA).  So it's useful if we need the speed, but
 * only if we're willing to trust the hardware manufacturer not to
 * have put in a back door.
 *
 * Return number of bytes filled in.
 */
int __must_check get_random_bytes_arch(void *buf, int nbytes)
{
	int left = nbytes;
	char *p = buf;

	trace_get_random_bytes_arch(left, _RET_IP_);
	while (left) {
		unsigned long v;
		int chunk = min_t(int, left, sizeof(unsigned long));

		if (!arch_get_random_long(&v))
			break;

		memcpy(p, &v, chunk);
		p += chunk;
		left -= chunk;
	}

	return nbytes - left;
}
EXPORT_SYMBOL(get_random_bytes_arch);

///*
// * init_std_data - initialize pool with system data
// *
// * @r: pool to initialize
// *
// * This function clears the pool's entropy count and mixes some system
// * data into the pool to prepare it for use. The pool is not cleared
// * as that can only decrease the entropy in the pool.
// */
//static void __init init_std_data(struct entropy_store *r)
//{
//	int i;
//	ktime_t now = ktime_get_real();
//	unsigned long rv;

//	mix_pool_bytes(r, &now, sizeof(now));
//	for (i = r->poolinfo->poolbytes; i > 0; i -= sizeof(rv)) {
//		if (!arch_get_random_seed_long(&rv) &&
//		    !arch_get_random_long(&rv))
//			rv = random_get_entropy();
//		mix_pool_bytes(r, &rv, sizeof(rv));
//	}
//	mix_pool_bytes(r, utsname(), sizeof(*(utsname())));
//}

///*
// * Note that setup_arch() may call add_device_randomness()
// * long before we get here. This allows seeding of the pools
// * with some platform dependent data very early in the boot
// * process. But it limits our options here. We must use
// * statically allocated structures that already have all
// * initializations complete at compile time. We should also
// * take care not to overwrite the precious per platform data
// * we were given.
// */
//int __init rand_initialize(void)
//{
//	init_std_data(&input_pool);
//	crng_initialize_primary(&primary_crng);
//	crng_global_init_time = jiffies;
//	if (ratelimit_disable) {
//		urandom_warning.interval = 0;
//		unseeded_warning.interval = 0;
//	}
//	return 0;
//}

//#ifdef CONFIG_BLOCK
//void rand_initialize_disk(struct gendisk *disk)
//{
//	struct timer_rand_state *state;

//	/*
//	 * If kzalloc returns null, we just won't use that entropy
//	 * source.
//	 */
//	state = kzalloc(sizeof(struct timer_rand_state), GFP_KERNEL);
//	if (state) {
//		state->last_time = INITIAL_JIFFIES;
//		disk->random = state;
//	}
//}
//#endif

//static ssize_t
//urandom_read_nowarn(struct file *file, char __user *buf, size_t nbytes,
//		    loff_t *ppos)
//{
//	int ret;

//	nbytes = min_t(size_t, nbytes, INT_MAX >> (ENTROPY_SHIFT + 3));
//	ret = extract_crng_user(buf, nbytes);
//	trace_urandom_read(8 * nbytes, 0, ENTROPY_BITS(&input_pool));
//	return ret;
//}

//static ssize_t
//urandom_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
//{
//	unsigned long flags;
//	static int maxwarn = 10;

//	if (!crng_ready() && maxwarn > 0) {
//		maxwarn--;
//		if (__ratelimit(&urandom_warning))
//			pr_notice("%s: uninitialized urandom read (%zd bytes read)\n",
//				  current->comm, nbytes);
//		spin_lock_irqsave(&primary_crng.lock, flags);
//		crng_init_cnt = 0;
//		spin_unlock_irqrestore(&primary_crng.lock, flags);
//	}

//	return urandom_read_nowarn(file, buf, nbytes, ppos);
//}

//static ssize_t
//random_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
//{
//	int ret;

//	ret = wait_for_random_bytes();
//	if (ret != 0)
//		return ret;
//	return urandom_read_nowarn(file, buf, nbytes, ppos);
//}

//static __poll_t
//random_poll(struct file *file, poll_table * wait)
//{
//	__poll_t mask;

//	poll_wait(file, &crng_init_wait, wait);
//	poll_wait(file, &random_write_wait, wait);
//	mask = 0;
//	if (crng_ready())
//		mask |= EPOLLIN | EPOLLRDNORM;
//	if (ENTROPY_BITS(&input_pool) < random_write_wakeup_bits)
//		mask |= EPOLLOUT | EPOLLWRNORM;
//	return mask;
//}

//static int
//write_pool(struct entropy_store *r, const char __user *buffer, size_t count)
//{
//	size_t bytes;
//	__u32 t, buf[16];
//	const char __user *p = buffer;

//	while (count > 0) {
//		int b, i = 0;

//		bytes = min(count, sizeof(buf));
//		if (copy_from_user(&buf, p, bytes))
//			return -EFAULT;

//		for (b = bytes ; b > 0 ; b -= sizeof(__u32), i++) {
//			if (!arch_get_random_int(&t))
//				break;
//			buf[i] ^= t;
//		}

//		count -= bytes;
//		p += bytes;

//		mix_pool_bytes(r, buf, bytes);
//		cond_resched();
//	}

//	return 0;
//}

//static ssize_t random_write(struct file *file, const char __user *buffer,
//			    size_t count, loff_t *ppos)
//{
//	size_t ret;

//	ret = write_pool(&input_pool, buffer, count);
//	if (ret)
//		return ret;

//	return (ssize_t)count;
//}

//static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
//{
//	int size, ent_count;
//	int __user *p = (int __user *)arg;
//	int retval;

//	switch (cmd) {
//	case RNDGETENTCNT:
//		/* inherently racy, no point locking */
//		ent_count = ENTROPY_BITS(&input_pool);
//		if (put_user(ent_count, p))
//			return -EFAULT;
//		return 0;
//	case RNDADDTOENTCNT:
//		if (!capable(CAP_SYS_ADMIN))
//			return -EPERM;
//		if (get_user(ent_count, p))
//			return -EFAULT;
//		return credit_entropy_bits_safe(&input_pool, ent_count);
//	case RNDADDENTROPY:
//		if (!capable(CAP_SYS_ADMIN))
//			return -EPERM;
//		if (get_user(ent_count, p++))
//			return -EFAULT;
//		if (ent_count < 0)
//			return -EINVAL;
//		if (get_user(size, p++))
//			return -EFAULT;
//		retval = write_pool(&input_pool, (const char __user *)p,
//				    size);
//		if (retval < 0)
//			return retval;
//		return credit_entropy_bits_safe(&input_pool, ent_count);
//	case RNDZAPENTCNT:
//	case RNDCLEARPOOL:
//		/*
//		 * Clear the entropy pool counters. We no longer clear
//		 * the entropy pool, as that's silly.
//		 */
//		if (!capable(CAP_SYS_ADMIN))
//			return -EPERM;
//		input_pool.entropy_count = 0;
//		return 0;
//	case RNDRESEEDCRNG:
//		if (!capable(CAP_SYS_ADMIN))
//			return -EPERM;
//		if (crng_init < 2)
//			return -ENODATA;
//		crng_reseed(&primary_crng, &input_pool);
//		crng_global_init_time = jiffies - 1;
//		return 0;
//	default:
//		return -EINVAL;
//	}
//}

//static int random_fasync(int fd, struct file *filp, int on)
//{
//	return fasync_helper(fd, filp, on, &fasync);
//}

//const struct file_operations random_fops = {
//	.read  = random_read,
//	.write = random_write,
//	.poll  = random_poll,
//	.unlocked_ioctl = random_ioctl,
//	.compat_ioctl = compat_ptr_ioctl,
//	.fasync = random_fasync,
//	.llseek = noop_llseek,
//};

//const struct file_operations urandom_fops = {
//	.read  = urandom_read,
//	.write = random_write,
//	.unlocked_ioctl = random_ioctl,
//	.compat_ioctl = compat_ptr_ioctl,
//	.fasync = random_fasync,
//	.llseek = noop_llseek,
//};

//SYSCALL_DEFINE3(getrandom, char __user *, buf, size_t, count,
//		unsigned int, flags)
//{
//	int ret;

//	if (flags & ~(GRND_NONBLOCK|GRND_RANDOM|GRND_INSECURE))
//		return -EINVAL;

//	/*
//	 * Requesting insecure and blocking randomness at the same time makes
//	 * no sense.
//	 */
//	if ((flags & (GRND_INSECURE|GRND_RANDOM)) == (GRND_INSECURE|GRND_RANDOM))
//		return -EINVAL;

//	if (count > INT_MAX)
//		count = INT_MAX;

//	if (!(flags & GRND_INSECURE) && !crng_ready()) {
//		if (flags & GRND_NONBLOCK)
//			return -EAGAIN;
//		ret = wait_for_random_bytes();
//		if (unlikely(ret))
//			return ret;
//	}
//	return urandom_read_nowarn(NULL, buf, count, NULL);
//}

///********************************************************************
// *
// * Sysctl interface
// *
// ********************************************************************/

//#ifdef CONFIG_SYSCTL

//#include <linux/sysctl.h>

//static int min_write_thresh;
//static int max_write_thresh = INPUT_POOL_WORDS * 32;
//static int random_min_urandom_seed = 60;
//static char sysctl_bootid[16];

///*
// * This function is used to return both the bootid UUID, and random
// * UUID.  The difference is in whether table->data is NULL; if it is,
// * then a new UUID is generated and returned to the user.
// *
// * If the user accesses this via the proc interface, the UUID will be
// * returned as an ASCII string in the standard UUID format; if via the
// * sysctl system call, as 16 bytes of binary data.
// */
//static int proc_do_uuid(struct ctl_table *table, int write,
//			void *buffer, size_t *lenp, loff_t *ppos)
//{
//	struct ctl_table fake_table;
//	unsigned char buf[64], tmp_uuid[16], *uuid;

//	uuid = table->data;
//	if (!uuid) {
//		uuid = tmp_uuid;
//		generate_random_uuid(uuid);
//	} else {
//		static DEFINE_SPINLOCK(bootid_spinlock);

//		spin_lock(&bootid_spinlock);
//		if (!uuid[8])
//			generate_random_uuid(uuid);
//		spin_unlock(&bootid_spinlock);
//	}

//	sprintf(buf, "%pU", uuid);

//	fake_table.data = buf;
//	fake_table.maxlen = sizeof(buf);

//	return proc_dostring(&fake_table, write, buffer, lenp, ppos);
//}

///*
// * Return entropy available scaled to integral bits
// */
//static int proc_do_entropy(struct ctl_table *table, int write,
//			   void *buffer, size_t *lenp, loff_t *ppos)
//{
//	struct ctl_table fake_table;
//	int entropy_count;

//	entropy_count = *(int *)table->data >> ENTROPY_SHIFT;

//	fake_table.data = &entropy_count;
//	fake_table.maxlen = sizeof(entropy_count);

//	return proc_dointvec(&fake_table, write, buffer, lenp, ppos);
//}

//static int sysctl_poolsize = INPUT_POOL_WORDS * 32;
//extern struct ctl_table random_table[];
//struct ctl_table random_table[] = {
//	{
//		.procname	= "poolsize",
//		.data		= &sysctl_poolsize,
//		.maxlen		= sizeof(int),
//		.mode		= 0444,
//		.proc_handler	= proc_dointvec,
//	},
//	{
//		.procname	= "entropy_avail",
//		.maxlen		= sizeof(int),
//		.mode		= 0444,
//		.proc_handler	= proc_do_entropy,
//		.data		= &input_pool.entropy_count,
//	},
//	{
//		.procname	= "write_wakeup_threshold",
//		.data		= &random_write_wakeup_bits,
//		.maxlen		= sizeof(int),
//		.mode		= 0644,
//		.proc_handler	= proc_dointvec_minmax,
//		.extra1		= &min_write_thresh,
//		.extra2		= &max_write_thresh,
//	},
//	{
//		.procname	= "urandom_min_reseed_secs",
//		.data		= &random_min_urandom_seed,
//		.maxlen		= sizeof(int),
//		.mode		= 0644,
//		.proc_handler	= proc_dointvec,
//	},
//	{
//		.procname	= "boot_id",
//		.data		= &sysctl_bootid,
//		.maxlen		= 16,
//		.mode		= 0444,
//		.proc_handler	= proc_do_uuid,
//	},
//	{
//		.procname	= "uuid",
//		.maxlen		= 16,
//		.mode		= 0444,
//		.proc_handler	= proc_do_uuid,
//	},
//#ifdef ADD_INTERRUPT_BENCH
//	{
//		.procname	= "add_interrupt_avg_cycles",
//		.data		= &avg_cycles,
//		.maxlen		= sizeof(avg_cycles),
//		.mode		= 0444,
//		.proc_handler	= proc_doulongvec_minmax,
//	},
//	{
//		.procname	= "add_interrupt_avg_deviation",
//		.data		= &avg_deviation,
//		.maxlen		= sizeof(avg_deviation),
//		.mode		= 0444,
//		.proc_handler	= proc_doulongvec_minmax,
//	},
//#endif
//	{ }
//};
//#endif 	/* CONFIG_SYSCTL */

//struct batched_entropy {
//	union {
//		u64 entropy_u64[CHACHA_BLOCK_SIZE / sizeof(u64)];
//		u32 entropy_u32[CHACHA_BLOCK_SIZE / sizeof(u32)];
//	};
//	unsigned int position;
//	spinlock_t batch_lock;
//};

///*
// * Get a random word for internal kernel use only. The quality of the random
// * number is good as /dev/urandom, but there is no backtrack protection, with
// * the goal of being quite fast and not depleting entropy. In order to ensure
// * that the randomness provided by this function is okay, the function
// * wait_for_random_bytes() should be called and return 0 at least once at any
// * point prior.
// */
//static DEFINE_PER_CPU(struct batched_entropy, batched_entropy_u64) = {
//	.batch_lock	= __SPIN_LOCK_UNLOCKED(batched_entropy_u64.lock),
//};

u64 get_random_u64(void)
{
	u64 ret = 0;
//	unsigned long flags;
//	struct batched_entropy *batch;
//	static void *previous;

//	warn_unseeded_randomness(&previous);

//	batch = raw_cpu_ptr(&batched_entropy_u64);
//	spin_lock_irqsave(&batch->batch_lock, flags);
//	if (batch->position % ARRAY_SIZE(batch->entropy_u64) == 0) {
//		extract_crng((u8 *)batch->entropy_u64);
//		batch->position = 0;
//	}
//	ret = batch->entropy_u64[batch->position++];
//	spin_unlock_irqrestore(&batch->batch_lock, flags);
    u64 high, low;
//    HAL_RNG_GenerateRandomNumber(&hrng, (u32 *)&high);
//    HAL_RNG_GenerateRandomNumber(&hrng, (u32 *)&low);
    ret = (high << 32) + low;
	return ret;
}
EXPORT_SYMBOL(get_random_u64);

//static DEFINE_PER_CPU(struct batched_entropy, batched_entropy_u32) = {
//	.batch_lock	= __SPIN_LOCK_UNLOCKED(batched_entropy_u32.lock),
//};
u32 get_random_u32(void)
{
	u32 ret = 0;
//	unsigned long flags;
//	struct batched_entropy *batch;
//	static void *previous;

//	warn_unseeded_randomness(&previous);

//	batch = raw_cpu_ptr(&batched_entropy_u32);
//	spin_lock_irqsave(&batch->batch_lock, flags);
//	if (batch->position % ARRAY_SIZE(batch->entropy_u32) == 0) {
//		extract_crng((u8 *)batch->entropy_u32);
//		batch->position = 0;
//	}
//	ret = batch->entropy_u32[batch->position++];
//	spin_unlock_irqrestore(&batch->batch_lock, flags);
//    HAL_RNG_GenerateRandomNumber(&hrng, &ret);
	return ret;
}
EXPORT_SYMBOL(get_random_u32);

///* It's important to invalidate all potential batched entropy that might
// * be stored before the crng is initialized, which we can do lazily by
// * simply resetting the counter to zero so that it's re-extracted on the
// * next usage. */
//static void invalidate_batched_entropy(void)
//{
//	int cpu;
//	unsigned long flags;

//	for_each_possible_cpu (cpu) {
//		struct batched_entropy *batched_entropy;

//		batched_entropy = per_cpu_ptr(&batched_entropy_u32, cpu);
//		spin_lock_irqsave(&batched_entropy->batch_lock, flags);
//		batched_entropy->position = 0;
//		spin_unlock(&batched_entropy->batch_lock);

//		batched_entropy = per_cpu_ptr(&batched_entropy_u64, cpu);
//		spin_lock(&batched_entropy->batch_lock);
//		batched_entropy->position = 0;
//		spin_unlock_irqrestore(&batched_entropy->batch_lock, flags);
//	}
//}

///**
// * randomize_page - Generate a random, page aligned address
// * @start:	The smallest acceptable address the caller will take.
// * @range:	The size of the area, starting at @start, within which the
// *		random address must fall.
// *
// * If @start + @range would overflow, @range is capped.
// *
// * NOTE: Historical use of randomize_range, which this replaces, presumed that
// * @start was already page aligned.  We now align it regardless.
// *
// * Return: A page aligned address within [start, start + range).  On error,
// * @start is returned.
// */
//unsigned long
//randomize_page(unsigned long start, unsigned long range)
//{
//	if (!PAGE_ALIGNED(start)) {
//		range -= PAGE_ALIGN(start) - start;
//		start = PAGE_ALIGN(start);
//	}

//	if (start > ULONG_MAX - range)
//		range = ULONG_MAX - start;

//	range >>= PAGE_SHIFT;

//	if (range == 0)
//		return start;

//	return start + (get_random_long() % range << PAGE_SHIFT);
//}

///* Interface for in-kernel drivers of true hardware RNGs.
// * Those devices may produce endless random bits and will be throttled
// * when our pool is full.
// */
//void add_hwgenerator_randomness(const char *buffer, size_t count,
//				size_t entropy)
//{
//	struct entropy_store *poolp = &input_pool;

//	if (unlikely(crng_init == 0)) {
//		crng_fast_load(buffer, count);
//		return;
//	}

//	/* Suspend writing if we're above the trickle threshold.
//	 * We'll be woken up again once below random_write_wakeup_thresh,
//	 * or when the calling thread is about to terminate.
//	 */
//	wait_event_interruptible(random_write_wait, kthread_should_stop() ||
//			ENTROPY_BITS(&input_pool) <= random_write_wakeup_bits);
//	mix_pool_bytes(poolp, buffer, count);
//	credit_entropy_bits(poolp, entropy);
//}
//EXPORT_SYMBOL_GPL(add_hwgenerator_randomness);

///* Handle random seed passed by bootloader.
// * If the seed is trustworthy, it would be regarded as hardware RNGs. Otherwise
// * it would be regarded as device data.
// * The decision is controlled by CONFIG_RANDOM_TRUST_BOOTLOADER.
// */
//void add_bootloader_randomness(const void *buf, unsigned int size)
//{
//	if (IS_ENABLED(CONFIG_RANDOM_TRUST_BOOTLOADER))
//		add_hwgenerator_randomness(buf, size, size * 8);
//	else
//		add_device_randomness(buf, size);
//}
//EXPORT_SYMBOL_GPL(add_bootloader_randomness);
